node = [1 1; 0.75 0.5; 1 0.5; 1 0; 0.5 0.75; 0.5 1; 0 1; 0.5 0.25; 0.25 0.5; 0.5 0; 0 0.5; 0 0];
elem = [4 3 2 8 10; 1 6 5 2 3; 7 11 9 5 6; 2 5 9 8 2; 12 10 8 9 11];
patch('Faces', elem, 'Vertices', node, 'Facecolor', 'g');
save meshex1.mat